<!-- 属性名:border-方位名词(bd+方位名词首字母,如bdl) -->
<!-- 属性值:边框线粗细 线条样式 颜色(不区分顺序) -->

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型-单方向边框线</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: pink;

            border-top: 1px solid #000;;
            border-right: 2px dashed red;

            border-left: 10px solid orange;
            border-bottom: 5px dotted green;
        }
    </style>
</head>
<body>
    <div>div标签</div>
</body>
</html>